.course_main{
    width: auto;
    margin-left: 250px;
    margin-top: 90px;
    margin-right: 15px;
    background-color: #fff;
    padding: 15px 30px;
    transition: margin-left 0.4s;
}

.course_top .form-group{
    margin: 0 15px;
}
.course_top .form-group label{
    color: #337ab7;
}

.course_top .form-control{
    border: none;
    outline: none;
    background-color: #EEF1F5;
    margin-left: 10px;
    font-weight: normal;
}
.course_top .radio label{
    margin: 0 30px;
}

.course_center{
    margin-top: 15px;
}
.course_center thead{
    background-color: #EEF1F5;
}

.course_center table tbody img{
    width: 150px;
    height: 105px;
}

.page {
    text-align: center;
    margin-top: -20px;
}